Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 07 Nov 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

11(7)

26(26)

41(-)

28(12)

0.5(5)

15(54)

South

25(15)

29(29)

67(-)

18(8)

0.5(5)

17(56)

East

13(8)

23(23)

43(-)

22(10)

0.5(5)

17(56)

West

8(5)

23(23)

61(-)

35(15)

0.5(5)

14(53)

Central

15(9)

22(22)

75(-)

33(14)

0.6(6)

13(52)

1-hr PM2.5 (µg/m3)b Readings on 07 Nov 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

15

12

12

11

10

13

10

20

22

18

19

19

South

6

12

9

5

14

26

24

18

12

18

31

37

East

17

15

11

10

12

11

12

17

19

25

14

16

West

8

5

9

4

9

17

18

9

9

25

20

19

Central

5

10

10

9

5

11

12

11

17

12

8

25

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

15

21

24

23

26

14

7

2

6

13

8

-

South

30

29

12

13

36

33

9

1

3

8

15

-

East

28

22

14

22

32

22

13

6

13

17

20

-

West

27

19

21

14

14

14

16

9

13

17

18

-

Central

13

30

20

17

35

26

6

4

7

14

12

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
07 Nov 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

44

38

43

40

39

46

53

55

55

56

58

60

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

62

64

62

60

62

63

60

51

32

37

51

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.